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CVE-2024-33621 is a Linux kernel ipvlan networking flaw in ipvlan_process_v4_outbound() and ipvlan_process_v6_outbound(). The outbound paths reused skb->sk when invoking IPv4 or IPv6 local output. For packets originating from an AF_PACKET socket, skb->sk refers to the packet socket rather than an IP-family socket. In the IPv6 multicast output path, this reaches sk_mc_loop(), which expects an appropriate IP socket family and triggers a WARN_ON_ONCE condition. The fix passes a NULL socket pointer to ip_local_out() and ip6_local_out(), consistent with other tunnel implementations, preventing the packet socket from being interpreted as an IP socket.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel IPvlan networking flaw caused by using skb->sk in IPv4 and IPv6 outbound processing.
Linux kernel IPvlan outbound packet socket-pointer handling flaw.
Linux kernel IPvlan flaw caused by use of skb->sk in IPv4 and IPv6 outbound processing.
Linux kernel ipvlan networking flaw involving use of skb->sk during IPv4 and IPv6 outbound processing.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.